01 - Preheat oven to 400°F. Line a baking sheet with parchment paper or lightly grease it.
02 - Pat the salmon fillets dry with paper towels. Rub with olive oil, salt, and pepper. Place fillets skin-side down on the prepared baking sheet.
03 - In a small saucepan, combine orange juice, honey, soy sauce, orange zest, and Dijon mustard. Bring to a gentle simmer over medium heat, stirring occasionally.
04 - Stir in the cornstarch slurry and cook for 1-2 minutes, until the glaze thickens slightly. Remove from heat.
05 - Brush a generous layer of orange glaze over each salmon fillet. Reserve extra glaze for serving.
06 - Bake salmon for 12-15 minutes, or until it flakes easily with a fork and is just opaque in the center.
07 - Transfer to plates, drizzle with reserved glaze, and garnish with parsley and orange slices if desired.